You can unblock an IP address or IP range, as well as remove a placement exclusion in 2 ways:

Unblocking from entity forensics

Visit the forensics page for the blocked / excluded entity you wish to change. Then hit the "Unblock" button:

Enter the reason for removing the exclusion and select campaigns you wish to remove it for:

Unblocking / removing exclusion from exclusion forensics

You can remove an exclusion directly from the exclusion forensics by clicking on the the "Unblock" button:

Enter the reason for removing the exclusion and select campaigns you wish to remove it for:

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